EP3247706A1 - Pet-kontrastmittel - Google Patents

Pet-kontrastmittel

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Publication number
EP3247706A1
EP3247706A1 EP16702985.9A EP16702985A EP3247706A1 EP 3247706 A1 EP3247706 A1 EP 3247706A1 EP 16702985 A EP16702985 A EP 16702985A EP 3247706 A1 EP3247706 A1 EP 3247706A1
Authority
EP
European Patent Office
Prior art keywords
methyl
compound
autotaxin
mmol
compound according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16702985.9A
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English (en)
French (fr)
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EP3247706B1 (de
Inventor
Yves Auberson
Emmanuelle Briard
Berndt Oberhauser
Darren Legrand
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Novartis AG
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Novartis AG
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00—Diagnosis using ultrasonic, sonic or infrasonic waves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/42—Oxazoles
    • A61K31/422—Oxazoles not condensed and containing further heterocyclic rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
    • A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/496—Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene or sparfloxacin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
    • A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
    • A61K51/04—Organic compounds
    • A61K51/041—Heterocyclic compounds
    • A61K51/044—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
    • A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
    • A61K51/04—Organic compounds
    • A61K51/041—Heterocyclic compounds
    • A61K51/044—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins
    • A61K51/0459—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins having six-membered rings with two nitrogen atoms as the only ring hetero atoms, e.g. piperazine
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K51/00—Preparations containing radioactive substances for use in therapy or testing in vivo
    • A61K51/02—Preparations containing radioactive substances for use in therapy or testing in vivo characterised by the carrier, i.e. characterised by the agent or material covalently linked or complexing the radioactive nucleus
    • A61K51/04—Organic compounds
    • A61K51/0474—Organic compounds complexes or complex-forming compounds, i.e. wherein a radioactive metal (e.g. 111In3+) is complexed or chelated by, e.g. a N2S2, N3S, NS3, N4 chelating group
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
    • C07B59/00—Introduction of isotopes of elements into organic compounds ; Labelled organic compounds per se
    • C07B59/002—Heterocyclic compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
    • C07D413/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
    • C07D413/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing three or more hetero rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
    • C07B2200/00—Indexing scheme relating to specific properties of organic compounds
    • C07B2200/05—Isotopically modified compounds, e.g. labelled

Definitions

  • This application relates to novel compounds, in particular novel radioactive compounds, salts of such compounds, their preparation, and the use of such novel radioactive compounds as radiotracers/markers for imaging techniques and diagnostics tools in the field of diseases or disorders mediated by and/or related to the enzyme autotaxin, such as fibrogenesis, pruritus, cirrhosis, cancer, neuropathic pain and kidney disease.
  • novel radioactive compounds such as radiotracers/markers for imaging techniques and diagnostics tools in the field of diseases or disorders mediated by and/or related to the enzyme autotaxin, such as fibrogenesis, pruritus, cirrhosis, cancer, neuropathic pain and kidney disease.
  • ATX Autotaxin
  • pyrophosphatase/phosphodiesterase ENPP2
  • ENPP2 is a secreted ectoenzyme known to possess lysophospholipase D activity (Umezu-Goto et al , 2002), and is responsible for producing the bioactive lipid mediator lysophosphatidic acid (LP A) by the hydrolysis of lysophosphatidylcholine (LPC) (Tokumura ei a/., 2002).
  • LPA is highly implicated in the pathogenesis of a number of physio-pathological diseases, including cancer (Liu et al , 2009; Mills & Moolenaar, 2003), neuropathic pain (Inoue et al, 2004) and fibrosis (Tager et al, 2008).
  • cancer Liu et al , 2009; Mills & Moolenaar, 2003
  • neuropathic pain Inoue et al, 2004
  • fibrosis Tager et al, 2008.
  • the lipid binds to specific G protein-coupled receptors of which there are seven known isoforms (Noguchi et al, 2009). Binding of LPA activates multiple signalling pathways (Mills & Moolenaar, 2003) including cell migration (van Dijk et al, 1998), proliferation and survival (Brindley, 2004).
  • Other cellular responses include smooth muscle contraction, apoptosis and platelet aggregation (Ti
  • ATX was originally identified as a cell motility-stimulating factor following isolation from human A2058 melanoma cells (Stracke et al, 1992). Subsequent work on the enzyme was focused towards its role as a motility factor due to its aberrant expression in many cancer types including breast and renal cancer (Stassar et al. , 2001), Hodgkin's lymphoma (Baumforth et al, 2005), follicular lymphoma (Masuda et al , 2008), as well as fibrosis of the lung and kidney (Hama et al, 2004).
  • ATX was characterised as a secreted lysophospholipase (lysoPLD) (Tokumura et al, 2002; Gesta et al , 2002). Since then ATX gene knockout mice have shown that the ATX-LPA signalling axis plays a vital role during embryonic development of the cardiovascular and neural system (Tanaka et al, 2006; van Meeteren et al, 2006), resulting in early embryonic lethality (Bachner et al , 1999).
  • lysoPLD lysophospholipase
  • ATX belongs to a family of proteins called nucleotide
  • ENPP pyrophosphatase/phosphodiesterase
  • the family consists of seven structurally related enzymes (ENPP 1-7) conserved within vertebrates which are numbered according to their discovery. They were originally defined by their ability to hydrolyse pyrophosphate or phosphodiester bonds of various nucleotides and nucleotides derivatives in vitro (Stefan et al , 1999; Goding et al, 1998; Gijsbers et al , 2001), though ENPP2 and choline phosphate esters (ENPP6 & 7) have specific activity for other extracellular non-nucleotide molecules.
  • ENPP2 ATX
  • ENPP2 is unique within the family as it is the only secreted protein, whereas other ENPP members are transmembrane proteins (Stefan et al , 2005).
  • Noninvasive nuclear imaging techniques can be used to obtain basic and diagnostic information about the physiology and biochemistry of living subjects, including experimental animals, patients and volunteers. These techniques rely on the use of imaging instruments that can detect radiation emitted from radiotracers administered to living subjects. The information obtained can be reconstructed to provide planar and tomographic images, which reveal the distribution and/or concentration of the radiotracer as a function of time.
  • PET Positron emission tomography
  • the technique involves the use of radiotracers labelled with positron emitting radionuclides that are designed to have in vivo properties, which permit the measurement of parameters regarding the physiology or biochemistry of a variety of processes in living tissue.
  • Positron emission tomography is a nuclear medicine, functional imaging technique that produces a three-dimensional image of functional processes in the body.
  • the system detects pairs of gamma rays emitted indirectly by a positron- emitting radionuclide (tracer), which is introduced into the body on a biologically active molecule.
  • Three-dimensional images of tracer concentration within the body are then constructed by computer analysis.
  • PET-CT scanners three dimensional imaging is often accomplished with the aid of a CT X-ray scan performed on the patient during the same session, in the same machine.
  • Radionuclides used in PET scanning are typically isotopes with short half- lives such as carbon-11 ( ⁇ 20 min), nitrogen-13 ( ⁇ 10 min), oxygen-15 ( ⁇ 2 min), PAT056663-US-PCT fluorine-18 ( ⁇ 110 min), or rubidium-82( ⁇ 1.27 min). These radionuclides are inco ⁇ orated either into compounds normally used by the body such as glucose (or glucose analogues), water, or ammonia, or into molecules that bind to receptors or other sites of drug action. Such labelled compounds are known as radiotracers. PET technology can be used to trace the biologic pathway of any compound in living humans (and many other species as well), provided it can be radiolabeled with a PET isotope. Thus, the specific processes that can be probed with PET are virtually limitless.
  • radiotracers Due to the short half-lives of most positron-emitting radioisotopes, the radiotracers have traditionally been produced using a cyclotron in close proximity to the PET imaging facility. The half-life of fluorine-18 is long enough that radiotracers labeled with fluorine-18 can be manufactured commercially at offsite locations and shipped to imaging centers.
  • Single-photon emission computed tomography is nuclear medicine imaging technique similar to PET. It also uses a radioactively labeled tracer and is based on the detection of gamma rays. In contrast to PET, the radioactive label used in SPECT, e.g. 123 I, emits a gamma radiation that is measured directly.
  • SPECT Single-photon emission computed tomography
  • the compounds described herein can be labelled with electron, positron or gamma emitting radioisotopes such as those described above, including, but not limited to, 3 H, 13 N, n C, C 14 , 18 F, 123 I, 124 I, 125 I, and/or 131 I.
  • this application provides a compound of the general Formula
  • R is halogen, -CF 3 , -OCF 3 , -OCH 3 , -CH 3 or CN;
  • A is a pyridinyl or oxazolyl group substituted with at least one substituent selected from halo-(Ci-6-alkyl), halo-(Ci -3 -alkyl)oxy(C 2 -4-alkyl), or halo-(Ci -3 -alkyl)oxy(C 2 -4- alkyl) oxy(C 2 -4-alkyl).
  • this application provides a compound of Formula I that optionally contains 3 H.
  • this application provides a compound of Formula I, wherein R is - CF 3 or -OCF 3 and wherein each of these groups may optionally contain at least one
  • this application provides a compound of Formula I, where "halo" or “halogen” is a moiety selected from F, Br, CI, or I. In still another aspect, halo or halogen is selected from 18 F, 19 F, 123 I, 124 I, 125 I or 13 T.
  • this application provides a compound of Formula I, where the carbon atom numbered "1" is selected from n C, 12 C or 14 C.
  • the compounds disclosed herein are autotaxin inhibitors. In their non-reacted
  • radioactive form i.e. when only containing C, F or I
  • these compounds may be used as therapeutic agents for diseases where autotaxin is involved.
  • the compounds of the invention may be used as diagnostic agents,
  • 3 11 14 18 123 for imaging or for radiotherapy. More specifically, in their H-, C-, C, F-, I-, 124 I-, 125 I- or 131 I-radiolabeled form, the compounds described herein can be used for diagnostic or imaging, or as radiotherapy agents. In particular, 3 H- and 14 C- radiolabeled derivatives may be used for in vitro and ex vivo radioligand binding
  • C-, F-, I- and I- radiolabeled derivatives may additionally be suitable for in vivo imaging using SPECT (single photon computer tomography) or PET (positron emission tomography) , e.g. to image autotaxin protein concentration, or to measure the occupancy of the binding site by a molecule binding to autotaxin.
  • SPECT single photon computer tomography
  • PET positron emission tomography
  • I-radiolabeled derivatives may be suitable as imaging agents and for radiotherapy, e.g. for the treatment of autotaxin-expressing tumors.
  • Radiolabeled autotaxin ligands may include, but are not limited to clinical studies to quantify autotaxin protein concentration in tissues, to PAT056663-US-PCT stage or monitor disease progression, or to measure the effect of a therapeutic treatment on autotaxin protein expression (see e.g. Hepatology 2012 56(4): 1391-400 for the link between ATX expression and pruritus of cholestasis). Radiolabeled autotaxin ligands may also be used ex vivo or in vivo to determine the receptor occupancy of a drug binding to autotaxin, as well as to image tumors associated with autotaxin-expressing cells, e.g. human hepatocellular carcinoma (see e.g. Molecular Cancer 2010, 9:71).
  • the present application provides agents for use as markers or radiotherapeutic agents for cancer imaging, or agents used for monitoring therapies and diseases in which autotaxin is involved, for instance pruritus of cholestasis, cirrhosis, diabetes, kidney diseases, pain, organ fibrosis, e.g. idiopathic pulmonary fibrosis.
  • a method for detection of autotaxin in a subject in recognized need thereof comprising: (i) administration of a compound of formula (I) as described anywhere herein, or a pharmaceutically acceptable salt thereof, to said subject; and (ii) detecting uptake of said compound by in vivo PET or SPECT imaging.
  • the method will provide information and data having utility in the diagnosis and clinical research of disorders in which autotaxin is involved.
  • the subject is a mammal, most suitably a human who has or is suspected of having a disorder in which autotaxin is involved.
  • the method may be performed quantitatively such that the amount or change in amount of autotaxin, or the density or change in density of autotaxin may be determined so as to diagnose or track progress of a disease.
  • the method may be used to locate autotaxin in vivo.
  • a method for quantification of the percentage or change in percentage of unbound autotaxin in a subject after administration of a ligand binding to autotaxin comprising:
  • step (iii) allowing a suitable amount of time to pass such that the compound administered in step (i) has radioactively decayed; then (iv) administration of an effective amount of either (a) a non-radiolabelled autotaxin ligand, or (b) a non-radiolabelled agent PAT056663-US-PCT influencing the endogenous level of autotaxin substrates, and contemporaneous administration of a radiolabeled compound of formula (I) or a pharmaceutically acceptable salt thereof as defined in step (i) ; and (v) detecting uptake of said compound of formula (I) administered in step (iv) by in vivo PET or SPECT imaging.
  • the time allowed to pass in step (iii) is suitably over 4 times the radioactive isotope half-life, more suitably at least 6 times the radioactive isotope half-life, and more suitably is such that the PET or SPECT signal from the radiolabeled compound of formula (I) administered in step (i) is no longer detectable.
  • a method for detection of autotaxin in a subject in recognized need thereof comprising: (i) administration of a radiolabeled compound of formula (I) as described anywhere in this application, or a
  • step (iv) detecting uptake of said compound of formula (I) administered in step (i) by in vivo PET or SPECT imaging.
  • a PET or SPECT imaging experiment will provide a three-dimensional image of the distribution of radioactivity, after tracer injection (e.g., a suitably labelled compound of Formula I) in a naive or pre-treated animal or human subject.
  • tracer injection e.g., a suitably labelled compound of Formula I
  • the compound of the invention will be injected into the blood circulation of a naive or pre-treated animal or human subject. After an optional waiting period allowing the molecule to distribute in the body, the subject will be placed into a PET or SPECT scanner, and an image of radioactivity distribution will be reconstructed after recording of a sufficient number of disintegration events.
  • a Magnetic Resonance Imaging or Computed Tomography X-ray scan may be performed in parallel to the PET or SPECT scan.
  • target expression e.g.
  • the radiolabeled compound may be injected without pre-treatment of therapy.
  • the radiolabelled compound PAT056663-US-PCT will be injected after drug treatment or after therapy and compare to baseline, i.e. the radioactivity signal observed before drug treatment of therapy.
  • the distribution of radioactivity derived from a labelled compound of Formula I can be measured by ex-vivo or in vitro autoradiography.
  • an animal is injected with a radiolabeled compound of Formula I (with or without pretreatment by a drug or therapy) and subsequently sacrificed.
  • the whole animal or an organ of interest is then frozen or embedded, sliced, and an image is produced after application of the slice against a radiographic film or an imaging plate, e.g. using a photostimulable phosphor plate and creating an image with a phosphor imager.
  • Mass spectra were acquired on LC-MS, SFC-MS, or GC-MS systems using electrospray, chemical and electron impact ionization methods from a range of instruments of the following configuration: Agilent 1100 HPLC systems with an Agilent 6110 Mass Spectrometer. [M+H] + refers to the protonated molecular ion of the chemical species.
  • NMR spectra were acquired on a Bruker AVANCE 400MHz or 500MHz or 600MHz NMR spectrometers using ICON-NMR, under TopSpin program control. Spectra were measured at 298K, unless indicated otherwise, and were referenced relative to the solvent resonance.
  • Step 1 2-(2-Bromo-5-chlorobenzyl)-5 -methyl -2H-tetrazole PAT056663-US-PCT
  • Step 3 (E)-3-(4-Chloro-2-((5-methyl-2H-tetrazol-2-yl)methyl)phenyl)acrylic acid
  • Step 4 (R,E)-tert-Butyl 4-(3-(4-chloro-2-((5-methyl-2H-tetrazol-2- yl)methyl)phenyl)acryloyl)-3-methylpiperazine- 1 -carboxylate
  • Step 5 (R,E)-3-(4-Chloro-2-((5-methyl-2H-tetrazol-2-yl)methyl)phenyl)-l-(2- methylpiperazin- 1 -yl)prop-2-en- 1 -one
  • Step 1 2-(2-Bromo-5-(trifluoromethyl)benzyl)-5-methyl-2H-tetrazole
  • Step 4 (R.E)-tert-Butvl 3-methyl-4-(3-(2-((5-methyl-2H-tetrazol-2-yl)methyl)-4- (trifluoromethyl)phenyl)acryloyl)piperazine- 1 -carboxylate
  • Step 5 (R,E)-3-(2-((5-Methyl-2H-tetrazol-2-yl)methyl)-4-(trifluoromethyl)phenyl)-l- (2-methylpiperazin- 1 -yl)prop-2-en- 1 -one
  • Step 1 2-(2-((6-methylpyridin-3-yl)oxy)ethoxy)ethanol
  • Step 2 2-(2-((6-methylpyridin-3-yl)oxy)ethoxy)ethyl 4-methylbenzene sulfonate
  • Step 4 5-(2-(2-fluoroethoxy)ethoxy)-2-methylpyridine 1 -oxide
  • Step 5 (5-(2-(2-fluoroethoxy)ethoxy)pyridin-2-yl)methyl acetate PAT056663-US-PCT
  • Step 6 (5 -(2-(2-fluoroethoxy)ethoxy)pyridin-2-yl)methanol
  • the crude product was purified by preparative HPLC (Waters SunFire C180DB, 5 ⁇ , 30x100, eluent: 1% MeCN/99% H 2 0 to 30% MeCN/70% H 2 0 in 20min, H 2 0 contains 0.1% of TFA, flow 40 mL/min).
  • the fractions containing the desired product were combined, diluted with EtOAc and washed with sat. aq. NaHC0 3 .
  • the aqueous layer was extracted with EtOAc.
  • the combined organic layers were washed with brine, dried over a phase separator and concentrated to give 291 mg of a white solid.
  • Step 1 (R.E)-3-(4-chloro-2-((5-methvl-2H-tetrazol-2-vl)methyl)phenvl)-l-(4-((5- hydroxypyridin-2-yl)methyl)-2-methylpiperazin- 1 -yl)prop-2-en- 1 -one
  • Step 2 (R,E)-3-(4-chloro-2-((5-me1hyl-2H-tetrazol-2-yl)me1hyl)phenyl)-l-(4-((5-(2- fluoroethoxy)pyridin-2-yl)methyl)-2-methylpiperazin- 1 -yl)prop-2-en- 1 -one
  • the title compound was prepared by a similar method to Example 4, from (R,E)-3-(2- ((5 -methyl -2H-tetrazol-2-yl)methyl)-4-(trifluoromethyl)phenyl)- 1 -(2- methylpiperazin-l-yl)prop-2-en-l-one (intermediate B) and 5-(2-(2- fluoroethoxy)ethoxy)picolinaldehyde (intermediate C).
  • the title compound was prepared by a similar method to Example 4, from (R,E)-3-(2- ((5 -methyl -2H-tetrazol-2-yl)methyl)-4-(trifluoromethyl)phenyl)- 1 -(2- methylpiperazin-l-yl)prop-2-en-l-one (intermediate B) and 2-(fluoromethyl)oxazole- 4-carbaldehyde (intermediate D).
  • Step 1 Synthesis of (R,E)-2-((6-((4-(3-(4-chloro-2-((5-methyl-2H-tetrazol-2- yl)methyl)phenyl)acryloyl)-3-methylpiperazin-l-yl)methyl)pyridin-3-yl)oxy)ethyl
  • the reaction mixture was diluted with water and the aqueous solution was extracted with ethyl acetate. The combined organic solutions were dried (Phase Separator) and concentrated. The crude product was purified by flash chromatography on silica gel (cyclohexane/EtOAc 100:0 to 0: 100) to obtain the desired product as a colorless oil (180 mg, 62%).
  • the labelled product was purified by semi- preparative HPLC (Phenomenex Luna C18(2), 250 x 10 mm; eluent: CH 3 CN/H 2 0/NEt 3 (50/50/0.1); flow: 4 mL/min).
  • HPLC Waters XBridge C18, 150 x 4.6 mm; Me OH/H 2 0/NEt 3 (70/30/0.08), 1 mL/min
  • the comparison with a cold reference HPLC trace (6.28 minutes) confirmed the product to be example 7, which was obtained with a decay-corrected radiochemical yield of 8%.
  • Example 8 (E)-3-(4-chloro-2-((5-methyl-2H-tetrazol-2-yl)methyl)phenyl)-l-((2R)-4- ((5 -(2-fluoroethoxy- 1 ,2-t2)pyridin-2-yl)methyl)-2-methylpiperazin- 1 -yl)prop-2-en- 1 - one
  • Step 1 Synthesis of [ 3 H] 2 -2-fluoroethyl 4-(p-tolyl)benzenesulfonate:
  • the solvent was removed in vacuo, and labile tritium was exchanged by adding 1 mL of methanol (Fluka 65543), stirring the solution, and removing the solvent again under vacuo. This process was repeated three times. Finally, the dried solid was extracted with 5 mL of THF. The activity of the crude product was 1003 mCi (37.1 GBq).
  • the radiochemical purity (RCP) was determined to be 74% using the following HPLC system: Macherey + Nagel Nucleodur Gravity C18 (5 ⁇ , 4.6 x 150 mm); solvents: A, 10 mM aq.
  • the reaction mixture was purified by HPLC using the following conditions: Macherey + Nagel Nucleodur Gravity C18, 5 ⁇ , 8 x 150 mm; solvents: A, 10 mM NH 4 OAc; B, MeCN; gradient: 0 min 48.5% B; 8 min 48.5% B; 8.5 min 95% B; 12.5 min 95% B; 13 min 48.5% B.; detection at 254 nm and 230 nm; flow rate: 3.1 ml/min; 20°C. The desired compound eluted after 6.7 min.
  • the desired product was isolated from the HPLC solvent mixture by solid phase extraction: .
  • the volume of the fractions was partially reduced at the rotary evaporator and the product was extracted with a Phenomenex StrataX cartridge (3 mL, 100 mg) which was eluted with 10 mL of ethanol.
  • the extracted product with an activity of 40.5 mCi (1.50 GBq) showed a RCP of >99%.
  • the specific activity was determined to 38.5 Ci/mmol (1.43 TBq/mmol).
  • the comparison with a cold reference HPLC trace confirmed the identity of the product.
  • HPLC conditions Macherey + Nagel PAT056663-US-PCT
  • the precursor (R,E)-2-(2-((6-((4-(3-(4-chloro-2-((5-methyl-2H-tetrazol-2- yl)methyl)phenyl)acryloyl)-3-methylpiperazin-l-yl)methyl)pyridin-3- yl)oxy)ethoxy)ethyl 4-methylbenzenesulfonate may be prepared by a similar method to compound 4 from (R,E)-3-(4-chloro-2-((5-methyl-2H-tetrazol-2- yl)methyl)phenyl)-l-(2-methylpiperazin-l-yl)prop-2-en-l-one (intermediate A) and 2- (2-((6-formylpyridin-3-yl)oxy)ethoxy)ethyl 4-methylbenzenesulfonate.
  • the precursor for radiolabeling may be prepared as shown below:
  • the reductive amination of 5-hydroxypicolinaldehyde with (R)-benzyl 2- methylpiperazine- 1 -carboxylate using sodium triacetoxyborohydride and acetic acid may provide (R)-benzyl 4-((5-hydroxypyridin-2-yl)methyl)-2-methylpiperazine-l- carboxylate.
  • This intermediate may further react with 2-fluoroethyl-tosylate in the presence of a base such as potassium carbonate followed by hydrogenation using palladium over carbon and hydrogen gas to lead to (R)-l-((5-(2-fluoroethoxy)pyridin- 2-yl)methyl)-3 -methylpiperazine .
  • (E)-2-(2-(2-bromovinyl)-5-chlorobenzyl)-5-methyl-2H-tetrazole may be prepared by microwave irradiation of (E)-3-(4-chloro-2-((5-methyl-2H-tetrazol-2- yl)methyl)phenyl)acrylic acid in the presence of N-bromosuccinimide and a catalytic amount of lithium acetate.
  • the resulting arylvinyl bromide may be converted into (E)- PAT056663-US-PCT
  • the title compound may be prepared by treating (E)-(4-chloro-2-((5-methyl-2H- tetrazol-2-yl)methyl)styryl)magnesium bromide with [ n C]C0 2 to form the [ n C]carboxymagnesium halide and then transformed into the [ n C]carboxylic acid. This could then be converted into an acid chloride and treated with (R)-l-((5-(2- fluoroethoxy)pyridin-2-yl)methyl)-3-methylpiperazine to afford the desired amide.
  • the precursor (R,E)- 1 -(4-((5-(2-fluoroethoxy)pyridin-2-yl)methyl)-2- methylpiperazin-l-yl)-3-(4-iodo-2-((5-methyl-2H-tetrazol-2-yl)methyl)phenyl)prop- 2-en-l-one may be obtained by following a similar protocol to example 1, starting from 5 -methyl -2H-tetrazole and l-bromo-2-(bromomethyl)-4-iodobenzene.
  • [ F](trifluoromethyl)phenyl) prop-2-en-l-one [ F]CF 3 Cu may be generated in situ from methyl chlorodifluoroacetate, Cul, TMEDA and [ 18 F]fluoride may react with (R,E)-l-(4-((5-(2-fluoroemoxy)pyridin-2-yl)methyl)-2-methylpiperazin-l-yl)-3-(4- iodo-2-((5-methyl-2H-tetrazol-2-yl)methyl)phenyl)prop-2-en-l-one to provide the title compound.
  • the [ n C]CN group may be introduced into (R,E)-l-(4-((5-(2-fluoroethoxy)pyridin-2- yl)methyl)-2-methylpiperazin-l-yl)-3-(4-isocyano-2-((5-methyl-2H-tetrazol-2- yl)methyl)phenyl)prop-2-en-l-one through a palladium mediated cyanation reaction.
  • [ n C]HCN may be converted into [ n C]CuCN and reacted with (R,E)-l-(4-((5-(2- fluoroethoxy)pyridin-2-yl)methyl)-2-methylpiperazin-l-yl)-3-(4-iodo-2-((5-methyl- 2H-tetrazol-2-yl)methyl)phenyl)prop-2-en-l-one through the Rosenmund-von Braun reaction.
  • a stannane precursor may be prepared by reacting (R,E)-l-(4-((5-(2- fluoroethoxy)pyridin-2-yl)methyl)-2-methylpiperazin-l-yl)-3-(4-iodo-2-((5-methyl- 2H-tetrazol-2-yl)methyl)phenyl)prop-2-en-l-one with bis(tributyltin) in the presence of a palladium catalyst such as Pd(PPli 3 )4:
  • the compounds described herein are ATX inhibitors and may be tested in the following assays.
  • Reagents - LPC (oleoyl (18: 1)) was purchased from Avanti Polar Lipids (Alabaster, AL) and solubilized in methanol to 20 mM. Amplex Red was obtained from
  • Protein - Recombinant human ATX was prepared at Novartis (Basel, CH) in a human embryonic kidney (HEK) cell preparation, and stored in single use aliquots of 26 mg/ml (26 ⁇ ) stocks stored at -80°C.
  • Assessing ATX inhibition - ATX activity was determined by measurement of released choline in reactions containing ATX ( ⁇ ), choline oxidase (0.1 U/ml), HRP (100 U/ml), amplex red (50 ⁇ ) and LPC 18: 1 (10 ⁇ ).
  • Compounds of the invention should be prepared as 10 point serial dilutions from 1 ⁇ in duplicate and pre- incubated with ATX at 37°C for 20 minutes prior to the addition of remaining reagents.
  • the liberated choline was measured from changes in fluorescence intensity ( ⁇ 530 nm, em 590 nm) of the product resurofin at 37°C every 2 minutes over a 40-minute period.
  • ATX activity was measured as a slope of the linear portion of the progress curve, typically between 14 to 24 minutes.
  • IC 50 values were determined from the concentration of compound that reduced the total activity by 50% and represent the mean of n > 2.

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